50 面向对象构造方法Constructor概述和格式

 1 class Demoe2_Construtor{
 2     public static void main(String[] args) {
 3         Person p1 = new Person();
 4         Person p2 = new Person("blit",20);
 5 
 6         p2.show();
 7 
 8         Person p3 =  new Person("li",80);
 9         p3.show();
10 
11         
12     }
13 }
14 
15 
16 class Person{
17     private String name;
18     private int age;
19 
20     public Person(String name,int age){
21         this.name = name;
22         this.age =age;
23         System.out.println("有参数的构造方法");
24     }
25 
26     public void show(){
27         System.out.println(age+":"+name);
28     }
29 }